I have the same issue. Mine is a manual and I average around 10.8L/100km driving normally, and last time I fuelled up I made a new 'trip' and decided to try and drive overly slowly and economically. So I've been driving round like a grandma for half a tank now and according to my trip computer I'm only averaging 9.6L/100km. A friend of mine recently bought a 2012 Impreza with a n/a EJ20 engine too, and he averages around 7.5L/100km just driving normally.

I don't understand how it is so thirsty?! Even when I'm highway cruising I can only get it down to 8.8L/100km. Must be the same with all 2.0R's.